Concrete-molding machine.



L. T. KENNY.

CONCRETE MOLDING MACHINE.

APPLICATION FILED AUG.19, 191a.

Patented May 5, 1914.

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witneoozo L. T. KENNY, CONCRETE MOLDING MACHINE.

APPLICATION FILED AUG.19 1913. I 1,095,21 6, Patented May 5, 1914.

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L.T.KENNY.

CONCRETE MOLDING MACHINE.

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I 5144mm 47% 77/72 Shem m COLUMBIA PLANO APH CO-,WASHIN LUTHER T. KENNY,'0F HAWARDEN, IOWA.

CONCRETE-MOLDING MACHINE.

Specification of Letters Patent.

Patented May 5, 1914.

Application filed August 19, 1913. Serial No. 785,542.

To all whom it may concern:

Be it known that I, LUTHER T. KENNY, a citizen of the United States, residing at Hawarden, in the county of Sioux and State of Iowa, have invented certain new and useful Improvements in Concrete-Molding Machines, of which the following is a specification.

This invention relates to new and useful improvements in molding machines.

The primary object of this invention is to provide a machine for the rapid and economical manufacture of cement or concrete blocks used in the construct-ion of silos, cisterns, water tanks, etc.

With the foregoing and other objects in view that will appear as the nature of the invention is better understood, the machine consists in the novel features of construction, combination and arrangements of parts illustrated in the drawings and more particularly pointed out in the appended claims.

In the accompanying drawings :Figure 1 is a plan View of a molding, machine embodying my improvements, the top of the mold box swung open. Fig. 2 is a front elevation of the machine. Fig. 3 is a vertical transverse section. Fig. 4 is a detail perspective view of the core in upright or molding position. Fig. 5 is a similar view of the core collapsed. Fig. 6 is a fragmentary sectional view and Fig. 7 is a perspective view of the product of the machine.

In the embodiment illustrated, 1 designates the supporting frame which is only diagrammatically illustrated and may be of any desired or approved pattern, 2 the moldbox which is attached to the supporting frame by the standards 8, and t the top of the mold which is hinged, as at 5, to the brackets or arms 6 extending horizontally from the upper edge of the back wall 7 of the mold.

The mold box or what may be termed the mold-proper comprises, in addition to the back wall 7, the end walls 8 which are hinged, as at 9, to the corners of the back wall. The mold box also comprises the front wall 10, both which and the back-wall are of arcuate outline, said front wall consisting of the half sections 11 hinged at their outer ends to the front edges of the end walls and secured or held together at their meeting ends by the taper lock pin 12 inserted through corresponding registering apertures in the overlapping off-sets or ears 13 formed or cast on the front face of the front wall 10 of the mold. The mold further comprises a collapsible core let consisting of the corresponding longitudinal sections or members 15 formed on a gradual curve toward the center of the mold box, corresponding with the curvature or contour of the back and front walls of the mold box.

By virtue of the foregoing construction of the front and back walls of the mold box and core sections or members when the mold box is in molding position, it is adapted to form cement or concrete blocks 16 of arcuate form and of uniform width, such as used in the construction of silos, cisterns, water-tanks, etc.

Again referring to the core members or sections, it will be observed that they are provided with the horizontal top portions 17, themselves provided with diverging outwardly inclined flanges 18 loosely connected together by the transverse bolts or rivets 19 which provide or constitute a partial hinge connection. The members or sections of the core are held in upright or molding position, while the concrete is tamped into the machine by the inwardly extending lugs or offsets 20 projecting from the top edges of the end walls 8 of the mold box, said ofi-sets engaging the recessed end portions 21 of the top walls 17 of the core members.

When the end walls 8 of the mold box are swung open, the engagement thus effected between the off-sets or lugs 20 and the ends of the core members is broken, the pressure of the concrete on the core members causing them to collapse until the flanges 18 are in engaged relation. The collapsed position of the core is shown in Fig. 5 of the drawings. Under these-conditions, the core may be withdrawn in a vertical plane from the mold box without disturbing or marring the freshly molded concrete. The top 4 of the mold box is provided with .a pair of laterally spaced longitudinally disposed ribs 22 adapted to form corresponding recesses or depressions in the top of the cementor concrete blocks. Each end wall 8 of the mold box is also provided with a pair of vertically disposed laterally spaced ribs 23 of approximately semi-circular form in cross.

section adapted to form corresponding recesses or grooves 24; in the ends of the cement or concrete blocks. When the blocks are laid together in endwise relation, the registering grooves or recesses 24 of the ad- 'acent blocks provide openings which are {filled with liquid concrete, the purpose of which will be obvious. The depressions or grooves 25 formed in the top edges of the blocks are for the purpose of receiving the reinforcement steel.

From the foregoing description taken in connection with the drawings, it is thought that the construction and advantages of this invention will be readily understood without requiring a more extended explanation by those versed in the art to which this invention appertains.

Various changes in the form proportions and minor details of construction may be resorted to without departing from the principles or sacrificing any out the advantages of this invention as defined in the appended claims.

Having described my invention what I claim as new, is:

1. In a molding machine of the character specified, a mold box comprising longitudinally disposed back and front walls formed on a gradual curve toward the center, end walls or members hinged to opposite ends of the back wall, a core consisting of a pair of corresponding longitudinally disposed sections, curved longitudinally toward the center of the mold box to correspond with the curvature of the front and back walls, a top hinged to the back wall and provided with a pair of longitudinally disposed laterally spaced tongues or ribs of semi-circular or other form in cross section adapted to form corresponding recesses or depressions in the top edges of the blocks, vertically disposed tongues or ribs formed on the in ner faces of the end walls to form corresponding grooves or recesses in the end edges of the blocks, the core members or sections having horizontal top portions pro vided with diverging outwardly inclined flanges and means for connecting the flanges of the respective sections together, whereby a partial hinge joint is established to pro vide for collapsing the core members preparatory to withdrawing the latter from the mold box after the cement or concrete is tamped.

2. In a molding machine of the character specified, a mold box comprising longitudinally disposed back and front walls formed on a gradual curve toward the center, end walls or members hinged to opposite ends of the back wall, a core consisting of a pair of corresponding longitudinally disposed sections curved longitudinally toward, the center of the mold box to correspond with the curvature of the front and back walls, a top hinged to the back wall and provided with a pair of longitudinally disposed laterally spaced tongues or ribs of semi-circular or other form in cross section adapted to term corresponding recesses or depressions in the top edges of the blocks, vertt callv disposed tongues or ribs formed on the inner faces of the end walls to form corresponding grooves or recesses in the end edges of the blocks, the core members or sections having horizontal top portions provided with diverging outwardly inclined flanges and means for loosely connecting the flanges of the respective sections together whereby a partial hinge joint is established to provide for collapsing the core members preparatory to withdrawing the latter from the mold box after the cement or concrete is tamped and means formed at the top edges of the end walls of the mold box for engaging and cooperating with the ends of the top portions of the core members, whereby the latter are held in upright or molding position when the end walls are closed, as during the tamping operation.

3. A molding machine of the character specified comprising a mold proper consisting of back, front and end walls the latter hinged to the former and the front wall to the front edges of the end walls, a hinged top for the mold box, a pair of longitudinally disposed inwardly curved tongues or ribs formed on the bottom of the top to form corresponding grooves or depressions in the top edges of the cement or concrete blocks, vertically disposed ribs on the inner face of the end walls to form corre sponding grooves or recesses in the end edges of the blocks, a collapsible core comprising a pair of corresponding core members curved longitudinally toward the center of the mold box to correspond with the curvature of the front and back walls, said core members having horizontal top portions provided with downwardly extending inwardly inclined flanges, joining means forming a partial hinge joint between flanges of the core members, whereby they are caused to assume an inwardly inclined position until the flanges are in en aged relation and horizontal inwardly extending oii'-sets formed at the top edges of the end walls to hold the core members in upright or molding position when the end walls are closed, as during the molding operation.

In testimony whereof I afiix my signature in presence of two witnesses.

CLARENCE A. PLANK, M. J. HAMMETT.

a Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. G. 

